[linux-2.6-block.git] / fs / sysfs / inode.c

/*
 * fs/sysfs/inode.c - basic sysfs inode and dentry operations
 *
 * Copyright (c) 2001-3 Patrick Mochel
 * Copyright (c) 2007 SUSE Linux Products GmbH
 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
 *
 * This file is released under the GPLv2.
 *
 * Please see Documentation/filesystems/sysfs.txt for more information.
 */

#undef DEBUG 

#include <linux/pagemap.h>
#include <linux/namei.h>
#include <linux/backing-dev.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/xattr.h>
#include <linux/security.h>
#include "sysfs.h"

extern struct super_block * sysfs_sb;

static const struct address_space_operations sysfs_aops = {
	.readpage	= simple_readpage,
	.write_begin	= simple_write_begin,
	.write_end	= simple_write_end,
};

static struct backing_dev_info sysfs_backing_dev_info = {
	.name		= "sysfs",
	.ra_pages	= 0,	/* No readahead */
	.capabilities	= BDI_CAP_NO_ACCT_AND_WRITEBACK,
};

static const struct inode_operations sysfs_inode_operations ={
	.setattr	= sysfs_setattr,
	.setxattr	= sysfs_setxattr,
};

int __init sysfs_inode_init(void)
{
	return bdi_init(&sysfs_backing_dev_info);
}

static struct sysfs_inode_attrs *sysfs_init_inode_attrs(struct sysfs_dirent *sd)
{
	struct sysfs_inode_attrs *attrs;
	struct iattr *iattrs;

	attrs = kzalloc(sizeof(struct sysfs_inode_attrs), GFP_KERNEL);
	if (!attrs)
		return NULL;
	iattrs = &attrs->ia_iattr;

	/* assign default attributes */
	iattrs->ia_mode = sd->s_mode;
	iattrs->ia_uid = 0;
	iattrs->ia_gid = 0;
	iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME;

	return attrs;
}

int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
{
	struct inode * inode = dentry->d_inode;
	struct sysfs_dirent * sd = dentry->d_fsdata;
	struct sysfs_inode_attrs *sd_attrs;
	struct iattr *iattrs;
	unsigned int ia_valid = iattr->ia_valid;
	int error;

	if (!sd)
		return -EINVAL;

	sd_attrs = sd->s_iattr;

	error = inode_change_ok(inode, iattr);
	if (error)
		return error;

	iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */

	error = inode_setattr(inode, iattr);
	if (error)
		return error;

	if (!sd_attrs) {
		/* setting attributes for the first time, allocate now */
		sd_attrs = sysfs_init_inode_attrs(sd);
		if (!sd_attrs)
			return -ENOMEM;
		sd->s_iattr = sd_attrs;
	} else {
		/* attributes were changed at least once in past */
		iattrs = &sd_attrs->ia_iattr;

		if (ia_valid & ATTR_UID)
			iattrs->ia_uid = iattr->ia_uid;
		if (ia_valid & ATTR_GID)
			iattrs->ia_gid = iattr->ia_gid;
		if (ia_valid & ATTR_ATIME)
			iattrs->ia_atime = iattr->ia_atime;
		if (ia_valid & ATTR_MTIME)
			iattrs->ia_mtime = iattr->ia_mtime;
		if (ia_valid & ATTR_CTIME)
			iattrs->ia_ctime = iattr->ia_ctime;
		if (ia_valid & ATTR_MODE) {
			umode_t mode = iattr->ia_mode;

			if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
				mode &= ~S_ISGID;
			iattrs->ia_mode = sd->s_mode = mode;
		}
	}
	return error;
}

static int sysfs_sd_setsecdata(struct sysfs_dirent *sd, void **secdata, u32 *secdata_len)
{
	struct sysfs_inode_attrs *iattrs;
	void *old_secdata;
	size_t old_secdata_len;

	iattrs = sd->s_iattr;
	if (!iattrs)
		iattrs = sysfs_init_inode_attrs(sd);
	if (!iattrs)
		return -ENOMEM;

	old_secdata = iattrs->ia_secdata;
	old_secdata_len = iattrs->ia_secdata_len;

	iattrs->ia_secdata = *secdata;
	iattrs->ia_secdata_len = *secdata_len;

	*secdata = old_secdata;
	*secdata_len = old_secdata_len;
	return 0;
}

int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
		size_t size, int flags)
{
	struct sysfs_dirent *sd = dentry->d_fsdata;
	void *secdata;
	int error;
	u32 secdata_len = 0;

	if (!sd)
		return -EINVAL;

	if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) {
		const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
		error = security_inode_setsecurity(dentry->d_inode, suffix,
						value, size, flags);
		if (error)
			goto out;
		error = security_inode_getsecctx(dentry->d_inode,
						&secdata, &secdata_len);
		if (error)
			goto out;

		mutex_lock(&sysfs_mutex);
		error = sysfs_sd_setsecdata(sd, &secdata, &secdata_len);
		mutex_unlock(&sysfs_mutex);

		if (secdata)
			security_release_secctx(secdata, secdata_len);
	} else
		return -EINVAL;
out:
	return error;
}

static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
{
	inode->i_mode = mode;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
}

static inline void set_inode_attr(struct inode * inode, struct iattr * iattr)
{
	inode->i_mode = iattr->ia_mode;
	inode->i_uid = iattr->ia_uid;
	inode->i_gid = iattr->ia_gid;
	inode->i_atime = iattr->ia_atime;
	inode->i_mtime = iattr->ia_mtime;
	inode->i_ctime = iattr->ia_ctime;
}


/*
 * sysfs has a different i_mutex lock order behavior for i_mutex than other
 * filesystems; sysfs i_mutex is called in many places with subsystem locks
 * held. At the same time, many of the VFS locking rules do not apply to
 * sysfs at all (cross directory rename for example). To untangle this mess
 * (which gives false positives in lockdep), we're giving sysfs inodes their
 * own class for i_mutex.
 */
static struct lock_class_key sysfs_inode_imutex_key;

static int sysfs_count_nlink(struct sysfs_dirent *sd)
{
	struct sysfs_dirent *child;
	int nr = 0;

	for (child = sd->s_dir.children; child; child = child->s_sibling)
		if (sysfs_type(child) == SYSFS_DIR)
			nr++;

	return nr + 2;
}

static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
{
	struct bin_attribute *bin_attr;
	struct sysfs_inode_attrs *iattrs;

	inode->i_private = sysfs_get(sd);
	inode->i_mapping->a_ops = &sysfs_aops;
	inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
	inode->i_op = &sysfs_inode_operations;
	inode->i_ino = sd->s_ino;
	lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);

	iattrs = sd->s_iattr;
	if (iattrs) {
		/* sysfs_dirent has non-default attributes
		 * get them for the new inode from persistent copy
		 * in sysfs_dirent
		 */
		set_inode_attr(inode, &iattrs->ia_iattr);
		if (iattrs->ia_secdata)
			security_inode_notifysecctx(inode,
						iattrs->ia_secdata,
						iattrs->ia_secdata_len);
	} else
		set_default_inode_attr(inode, sd->s_mode);

	/* initialize inode according to type */
	switch (sysfs_type(sd)) {
	case SYSFS_DIR:
		inode->i_op = &sysfs_dir_inode_operations;
		inode->i_fop = &sysfs_dir_operations;
		inode->i_nlink = sysfs_count_nlink(sd);
		break;
	case SYSFS_KOBJ_ATTR:
		inode->i_size = PAGE_SIZE;
		inode->i_fop = &sysfs_file_operations;
		break;
	case SYSFS_KOBJ_BIN_ATTR:
		bin_attr = sd->s_bin_attr.bin_attr;
		inode->i_size = bin_attr->size;
		inode->i_fop = &bin_fops;
		break;
	case SYSFS_KOBJ_LINK:
		inode->i_op = &sysfs_symlink_inode_operations;
		break;
	default:
		BUG();
	}

	unlock_new_inode(inode);
}

/**
 *	sysfs_get_inode - get inode for sysfs_dirent
 *	@sd: sysfs_dirent to allocate inode for
 *
 *	Get inode for @sd.  If such inode doesn't exist, a new inode
 *	is allocated and basics are initialized.  New inode is
 *	returned locked.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	Pointer to allocated inode on success, NULL on failure.
 */
struct inode * sysfs_get_inode(struct sysfs_dirent *sd)
{
	struct inode *inode;

	inode = iget_locked(sysfs_sb, sd->s_ino);
	if (inode && (inode->i_state & I_NEW))
		sysfs_init_inode(sd, inode);

	return inode;
}

/*
 * The sysfs_dirent serves as both an inode and a directory entry for sysfs.
 * To prevent the sysfs inode numbers from being freed prematurely we take a
 * reference to sysfs_dirent from the sysfs inode.  A
 * super_operations.delete_inode() implementation is needed to drop that
 * reference upon inode destruction.
 */
void sysfs_delete_inode(struct inode *inode)
{
	struct sysfs_dirent *sd  = inode->i_private;

	truncate_inode_pages(&inode->i_data, 0);
	clear_inode(inode);
	sysfs_put(sd);
}

int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name)
{
	struct sysfs_addrm_cxt acxt;
	struct sysfs_dirent *sd;

	if (!dir_sd)
		return -ENOENT;

	sysfs_addrm_start(&acxt, dir_sd);

	sd = sysfs_find_dirent(dir_sd, name);
	if (sd)
		sysfs_remove_one(&acxt, sd);

	sysfs_addrm_finish(&acxt);

	if (sd)
		return 0;
	else
		return -ENOENT;
}
Commit	Line	Data
1da177e4	1	/*
6d66f5cd	2	* fs/sysfs/inode.c - basic sysfs inode and dentry operations
1da177e4	3	*
6d66f5cd TH	4	* Copyright (c) 2001-3 Patrick Mochel
	5	* Copyright (c) 2007 SUSE Linux Products GmbH
	6	* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
	7	*
	8	* This file is released under the GPLv2.
1da177e4 LT	9	*
	10	* Please see Documentation/filesystems/sysfs.txt for more information.
	11	*/
	12
	13	#undef DEBUG
	14
	15	#include <linux/pagemap.h>
	16	#include <linux/namei.h>
	17	#include <linux/backing-dev.h>
16f7e0fe	18	#include <linux/capability.h>
995982ca	19	#include <linux/errno.h>
e8edc6e0	20	#include <linux/sched.h>
ddd29ec6 DQ	21	#include <linux/xattr.h>
ddd29ec6 DQ	22	#include <linux/security.h>
1da177e4 LT	23	#include "sysfs.h"
	24
	25	extern struct super_block * sysfs_sb;
	26
f5e54d6e	27	static const struct address_space_operations sysfs_aops = {
1da177e4	28	.readpage = simple_readpage,
800d15a5 NP	29	.write_begin = simple_write_begin,
800d15a5 NP	30	.write_end = simple_write_end,
1da177e4 LT	31	};
	32
	33	static struct backing_dev_info sysfs_backing_dev_info = {
d993831f	34	.name = "sysfs",
1da177e4	35	.ra_pages = 0, /* No readahead */
e4ad08fe	36	.capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
1da177e4 LT	37	};
1da177e4 LT	38
c5ef1c42	39	static const struct inode_operations sysfs_inode_operations ={
988d186d	40	.setattr = sysfs_setattr,
ddd29ec6	41	.setxattr = sysfs_setxattr,
988d186d MS	42	};
988d186d MS	43
e0bf68dd PZ	44	int __init sysfs_inode_init(void)
	45	{
	46	return bdi_init(&sysfs_backing_dev_info);
	47	}
	48
f38506c4	49	static struct sysfs_inode_attrs sysfs_init_inode_attrs(struct sysfs_dirent sd)
ddd29ec6 DQ	50	{
	51	struct sysfs_inode_attrs *attrs;
	52	struct iattr *iattrs;
	53
	54	attrs = kzalloc(sizeof(struct sysfs_inode_attrs), GFP_KERNEL);
	55	if (!attrs)
	56	return NULL;
	57	iattrs = &attrs->ia_iattr;
	58
	59	/* assign default attributes */
	60	iattrs->ia_mode = sd->s_mode;
	61	iattrs->ia_uid = 0;
	62	iattrs->ia_gid = 0;
	63	iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME;
	64
	65	return attrs;
	66	}
f38506c4	67
988d186d MS	68	int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
	69	{
	70	struct inode * inode = dentry->d_inode;
	71	struct sysfs_dirent * sd = dentry->d_fsdata;
ddd29ec6 DQ	72	struct sysfs_inode_attrs *sd_attrs;
ddd29ec6 DQ	73	struct iattr *iattrs;
988d186d MS	74	unsigned int ia_valid = iattr->ia_valid;
	75	int error;
	76
	77	if (!sd)
	78	return -EINVAL;
	79
ddd29ec6	80	sd_attrs = sd->s_iattr;
988d186d MS	81
	82	error = inode_change_ok(inode, iattr);
	83	if (error)
	84	return error;
	85
40a2159a BH	86	iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
40a2159a BH	87
988d186d MS	88	error = inode_setattr(inode, iattr);
	89	if (error)
	90	return error;
	91
ddd29ec6	92	if (!sd_attrs) {
988d186d	93	/* setting attributes for the first time, allocate now */
ddd29ec6 DQ	94	sd_attrs = sysfs_init_inode_attrs(sd);
ddd29ec6 DQ	95	if (!sd_attrs)
988d186d	96	return -ENOMEM;
ddd29ec6 DQ	97	sd->s_iattr = sd_attrs;
	98	} else {
	99	/* attributes were changed at least once in past */
	100	iattrs = &sd_attrs->ia_iattr;
	101
	102	if (ia_valid & ATTR_UID)
	103	iattrs->ia_uid = iattr->ia_uid;
	104	if (ia_valid & ATTR_GID)
	105	iattrs->ia_gid = iattr->ia_gid;
	106	if (ia_valid & ATTR_ATIME)
4be3df28	107	iattrs->ia_atime = iattr->ia_atime;
ddd29ec6	108	if (ia_valid & ATTR_MTIME)
4be3df28	109	iattrs->ia_mtime = iattr->ia_mtime;
ddd29ec6	110	if (ia_valid & ATTR_CTIME)
4be3df28	111	iattrs->ia_ctime = iattr->ia_ctime;
ddd29ec6 DQ	112	if (ia_valid & ATTR_MODE) {
	113	umode_t mode = iattr->ia_mode;
	114
	115	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
	116	mode &= ~S_ISGID;
	117	iattrs->ia_mode = sd->s_mode = mode;
	118	}
988d186d	119	}
ddd29ec6 DQ	120	return error;
ddd29ec6 DQ	121	}
988d186d	122
f44d3e78 EB	123	static int sysfs_sd_setsecdata(struct sysfs_dirent sd, void secdata, u32 secdata_len)
	124	{
	125	struct sysfs_inode_attrs *iattrs;
	126	void *old_secdata;
	127	size_t old_secdata_len;
	128
	129	iattrs = sd->s_iattr;
	130	if (!iattrs)
	131	iattrs = sysfs_init_inode_attrs(sd);
	132	if (!iattrs)
	133	return -ENOMEM;
	134
	135	old_secdata = iattrs->ia_secdata;
	136	old_secdata_len = iattrs->ia_secdata_len;
	137
	138	iattrs->ia_secdata = *secdata;
	139	iattrs->ia_secdata_len = *secdata_len;
	140
	141	*secdata = old_secdata;
	142	*secdata_len = old_secdata_len;
	143	return 0;
	144	}
	145
ddd29ec6 DQ	146	int sysfs_setxattr(struct dentry dentry, const char name, const void *value,
	147	size_t size, int flags)
	148	{
	149	struct sysfs_dirent *sd = dentry->d_fsdata;
ddd29ec6 DQ	150	void *secdata;
	151	int error;
	152	u32 secdata_len = 0;
	153
	154	if (!sd)
	155	return -EINVAL;
ddd29ec6 DQ	156
	157	if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) {
	158	const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
	159	error = security_inode_setsecurity(dentry->d_inode, suffix,
	160	value, size, flags);
	161	if (error)
	162	goto out;
	163	error = security_inode_getsecctx(dentry->d_inode,
	164	&secdata, &secdata_len);
	165	if (error)
	166	goto out;
988d186d	167
f44d3e78 EB	168	mutex_lock(&sysfs_mutex);
	169	error = sysfs_sd_setsecdata(sd, &secdata, &secdata_len);
	170	mutex_unlock(&sysfs_mutex);
	171
	172	if (secdata)
	173	security_release_secctx(secdata, secdata_len);
ddd29ec6 DQ	174	} else
	175	return -EINVAL;
	176	out:
988d186d MS	177	return error;
	178	}
	179
8215534c MS	180	static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
	181	{
	182	inode->i_mode = mode;
8215534c MS	183	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	184	}
	185
	186	static inline void set_inode_attr(struct inode * inode, struct iattr * iattr)
	187	{
	188	inode->i_mode = iattr->ia_mode;
	189	inode->i_uid = iattr->ia_uid;
	190	inode->i_gid = iattr->ia_gid;
	191	inode->i_atime = iattr->ia_atime;
	192	inode->i_mtime = iattr->ia_mtime;
	193	inode->i_ctime = iattr->ia_ctime;
	194	}
	195
232ba9db AV	196
	197	/*
	198	* sysfs has a different i_mutex lock order behavior for i_mutex than other
	199	* filesystems; sysfs i_mutex is called in many places with subsystem locks
	200	* held. At the same time, many of the VFS locking rules do not apply to
	201	* sysfs at all (cross directory rename for example). To untangle this mess
	202	* (which gives false positives in lockdep), we're giving sysfs inodes their
	203	* own class for i_mutex.
	204	*/
	205	static struct lock_class_key sysfs_inode_imutex_key;
	206
372e88bd EB	207	static int sysfs_count_nlink(struct sysfs_dirent *sd)
	208	{
	209	struct sysfs_dirent *child;
	210	int nr = 0;
	211
bc747f37	212	for (child = sd->s_dir.children; child; child = child->s_sibling)
372e88bd EB	213	if (sysfs_type(child) == SYSFS_DIR)
	214	nr++;
	215
	216	return nr + 2;
	217	}
	218
bc37e283	219	static void sysfs_init_inode(struct sysfs_dirent sd, struct inode inode)
1da177e4	220	{
372e88bd	221	struct bin_attribute *bin_attr;
ddd29ec6	222	struct sysfs_inode_attrs *iattrs;
372e88bd	223
04256b4a	224	inode->i_private = sysfs_get(sd);
fc9f54b9 TH	225	inode->i_mapping->a_ops = &sysfs_aops;
	226	inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
	227	inode->i_op = &sysfs_inode_operations;
	228	inode->i_ino = sd->s_ino;
	229	lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);
	230
ddd29ec6 DQ	231	iattrs = sd->s_iattr;
ddd29ec6 DQ	232	if (iattrs) {
fc9f54b9 TH	233	/* sysfs_dirent has non-default attributes
	234	* get them for the new inode from persistent copy
	235	* in sysfs_dirent
	236	*/
ddd29ec6 DQ	237	set_inode_attr(inode, &iattrs->ia_iattr);
	238	if (iattrs->ia_secdata)
	239	security_inode_notifysecctx(inode,
	240	iattrs->ia_secdata,
	241	iattrs->ia_secdata_len);
fc9f54b9 TH	242	} else
fc9f54b9 TH	243	set_default_inode_attr(inode, sd->s_mode);
372e88bd	244
372e88bd EB	245	/* initialize inode according to type */
372e88bd EB	246	switch (sysfs_type(sd)) {
372e88bd EB	247	case SYSFS_DIR:
	248	inode->i_op = &sysfs_dir_inode_operations;
	249	inode->i_fop = &sysfs_dir_operations;
	250	inode->i_nlink = sysfs_count_nlink(sd);
	251	break;
	252	case SYSFS_KOBJ_ATTR:
	253	inode->i_size = PAGE_SIZE;
	254	inode->i_fop = &sysfs_file_operations;
	255	break;
	256	case SYSFS_KOBJ_BIN_ATTR:
b1fc3d61	257	bin_attr = sd->s_bin_attr.bin_attr;
372e88bd EB	258	inode->i_size = bin_attr->size;
	259	inode->i_fop = &bin_fops;
	260	break;
	261	case SYSFS_KOBJ_LINK:
	262	inode->i_op = &sysfs_symlink_inode_operations;
	263	break;
	264	default:
	265	BUG();
	266	}
	267
	268	unlock_new_inode(inode);
fc9f54b9 TH	269	}
	270
	271	/**
8312a8d7	272	* sysfs_get_inode - get inode for sysfs_dirent
fc9f54b9 TH	273	* @sd: sysfs_dirent to allocate inode for
fc9f54b9 TH	274	*
8312a8d7 TH	275	* Get inode for @sd. If such inode doesn't exist, a new inode
	276	* is allocated and basics are initialized. New inode is
	277	* returned locked.
fc9f54b9 TH	278	*
	279	* LOCKING:
	280	* Kernel thread context (may sleep).
	281	*
	282	* RETURNS:
	283	* Pointer to allocated inode on success, NULL on failure.
	284	*/
8312a8d7	285	struct inode * sysfs_get_inode(struct sysfs_dirent *sd)
fc9f54b9 TH	286	{
	287	struct inode *inode;
	288
8312a8d7 TH	289	inode = iget_locked(sysfs_sb, sd->s_ino);
8312a8d7 TH	290	if (inode && (inode->i_state & I_NEW))
fc9f54b9 TH	291	sysfs_init_inode(sd, inode);
fc9f54b9 TH	292
1da177e4 LT	293	return inode;
	294	}
	295
04256b4a EB	296	/*
	297	* The sysfs_dirent serves as both an inode and a directory entry for sysfs.
	298	* To prevent the sysfs inode numbers from being freed prematurely we take a
	299	* reference to sysfs_dirent from the sysfs inode. A
	300	* super_operations.delete_inode() implementation is needed to drop that
	301	* reference upon inode destruction.
	302	*/
	303	void sysfs_delete_inode(struct inode *inode)
	304	{
	305	struct sysfs_dirent *sd = inode->i_private;
	306
	307	truncate_inode_pages(&inode->i_data, 0);
	308	clear_inode(inode);
	309	sysfs_put(sd);
	310	}
	311
608e266a	312	int sysfs_hash_and_remove(struct sysfs_dirent dir_sd, const char name)
1da177e4	313	{
fb6896da	314	struct sysfs_addrm_cxt acxt;
41fc1c27	315	struct sysfs_dirent *sd;
641e6f30	316
608e266a	317	if (!dir_sd)
995982ca	318	return -ENOENT;
1da177e4	319
fb6896da	320	sysfs_addrm_start(&acxt, dir_sd);
608e266a	321
41fc1c27 TH	322	sd = sysfs_find_dirent(dir_sd, name);
	323	if (sd)
	324	sysfs_remove_one(&acxt, sd);
3007e997	325
990e53f8 TH	326	sysfs_addrm_finish(&acxt);
	327
	328	if (sd)
fb6896da	329	return 0;
990e53f8 TH	330	else
990e53f8 TH	331	return -ENOENT;
1da177e4	332	}